Bag



FIG. 1 is a front perspective view of a bag showing my design;

FIG. 2 is a top perspective thereof.

FIG. 3 is an open configuration thereof; and,

FIG. 4 is a closed configuration thereof.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a bag, as shown. 